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Major mite taxa—Key feature pages

Solenidia

Solenidiasolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
 are chemosensory (olfactory) structures that are usually thick, blunt setae with immovable bases and banded patterns of minute 'pores' (or thin areas of cuticle) when viewed at high magnification on a light microscope. Some solenidiasolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
 are minute, slender, or globoseglobose:
spherical.
 in shape, and typically occur on the tarsitarsus:
(pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
, especially of legs I and II (and legs IV of some males). In some early derivative acariform mites, the genuagenu:
(pl. genua) (= patella) the 4th leg segment, between the femur and tibia.
, tibiaetibia:
(pl. tibiae) the leg segment between the genu and the tarsus.
, and even femora may bear solenidiasolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
 as well.

Parasitiform mites do not have solenidiasolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
, except on legs I of ticks. Instead, most parasitiformans have specialized 'contact chemoreceptor' setae, each of which has a 'pore' at its tip.

Solenidiasolenidion:
(pl. solenidia) a hollow, optically inactive chemosensory seta on the limbs of acariform mites appearing to have transverse rows of minute pores (actually pore canals) under light microscopy, (the transverse pattern is often not apparent in SEM); often bulbous or otherwise modified; sometimes associated with a companion seta.  Solenidia are designated with Greek letters by leg segment: Ω (omega) on the tarsus, Φ (phi) on the tibia, and Σ (sigma) on the genu.
 that are recumbent (as opposed to erect) and lie in furrows on tarsustarsus:
(pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
 I are characteristic of the Rhagidiidae and a few related families of Eupodina and are called rhagidial organsrhagidial organs:
recumbent solenidia in shallow depressions on the distal segments of legs I-II in Eupodoidea (Prostigmata).
.

Haller's Organ is a specialized sensory area with chemosensory setae and usually consists of a deep pit (ticks, holothyrans) and/or a shallow depression on tarsustarsus:
(pl. tarsi) the subdistal leg segment between the tibia and the pretarsus (apotele).
 I (some mesostigmatans).

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